guochanhua/server/application/api/request/ZskkDefaultRequest.php

<?php

namespace app\api\request;
use app\common\base\request\BaseRequest;

class ZskkDefaultRequest extends BaseRequest {
    private static $instance = null;
    public static function instance() {
        return is_null(self::$instance) ? new ZskkDefaultRequest() : self::$instance;
    }
}